/*
*    Qizx/open 3.0 beta
*
* This code is the open-source version of Qizx.
* Copyright (C) 2004-2009 Axyana Software -- All rights reserved.
*
* The contents of this file are subject to the Mozilla Public License 
*  Version 1.1 (the "License"); you may not use this file except in 
*  compliance with the License. You may obtain a copy of the License at
*  http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
*  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
*  for the specific language governing rights and limitations under the
*  License.
*
* The Initial Developer of the Original Code is Xavier Franc - Axyana Software.
*
*/
using System;
using EvaluationException = System.Qizx.Api.EvaluationException;
using QizxException = System.Qizx.Api.QizxException;
using Comparison = System.Qizx.Util.Basic.Comparison;
using Utils = System.Qizx.Util.Basic.Utils;
using Conversion = System.Qizx.Xdm.Conversion;
using BaseValue = System.Qizx.XQuery.BaseValue;
using ComparisonContext = System.Qizx.XQuery.ComparisonContext;
using XQItem = System.Qizx.XQuery.XQItem;
using XQType = System.Qizx.XQuery.XQType;
using XQTypeException = System.Qizx.XQuery.XQTypeException;
namespace System.Qizx.XQuery.Dt
{
	
	/// <summary> Abstract decimal value.</summary>
	public abstract class DecimalValue:BaseValue
	{
		public abstract System.Decimal Value{get;}
		public override XQItem Item
		{
			get
			{
				return this;
			}
			
		}
		public override string ValueAsString
		{
			get
			{
				return Conversion.ToString(Value);
			}
			
		}
		public override double ValueAsDouble
		{
			get
			{
				return System.Decimal.ToDouble(Value);
			}
			
		}
		public override float ValueAsFloat
		{
			get
			{
				return System.Decimal.ToSingle(Value);
			}
			
		}
		public override bool ValueAsBoolean
		{
			get
			{
				System.Decimal d = Value;
				return System.Math.Sign(d) != 0; // not obvious, equals(ZERO) wont work
			}
			
		}
		public override System.Object Object
		{
			get
			{
				return Value;
			}
			
		}
		public DecimalValue()
		{
			itemType = XQType.DECIMAL;
		}
		
		public  override bool Equals(System.Object that)
		{
			if (!(that is DecimalValue))
				return false;
			return Value.Equals(((DecimalValue) that).Value);
		}
		
		public override int GetHashCode()
		{
			return Utils.hashDouble(System.Decimal.ToDouble(Value));
		}
		
		public override int CompareTo(XQItem that, ComparisonContext context, int flags)
		{
			double d;
			switch (that.ItemType.quickCode())
			{
				
				case XQType.QT_UNTYPED: 
					if ((flags & System.Qizx.XQuery.XQItemCompareType.COMPAR_VALUE) != 0)
						return Comparison.ERROR;
					goto case XQType.QT_FLOAT;
				
				case XQType.QT_FLOAT: 
					float f = that.ValueAsFloat;
					if (context == null || (flags & System.Qizx.XQuery.XQItemCompareType.COMPAR_VALUE) != 0)
						return compare(ValueAsFloat, f);
					return compare(ValueAsFloat, f, context.emptyGreatest());
				
				case XQType.QT_DOUBLE: 
					d = that.ValueAsDouble;
					if (context == null)
						return compare(ValueAsDouble, d);
					return compare(ValueAsDouble, d, context.emptyGreatest());
				
				case XQType.QT_DEC: 
					return Value.CompareTo(that.ValueAsDecimal);
				
				case XQType.QT_INT: 
					int cmp = Value.CompareTo(new System.Decimal(that.ValueAsInteger));
					return cmp;
				
				default: 
					return Comparison.ERROR;
				
			}
		}
	}
}